Sunday marked the 13th annual No Pants Subway Ride, a tradition that began in New York City in 2001 and now takes place on trains in 65 cities in 25 countries. You're welcome, rest of the world.

Originally begun by Improv Everywhere, a "prank collective that causes scenes of chaos and joy in public places," the No Pants Subway Ride has become a staple in each of its home cities. As if the New York subway needed to be any more chaotic. Here are the most hilarious photos from this year's ride: